Thanks for the reply.
So I managed something to sync:
URL: http://ftp.nl.debian.org/debian
Release: stable
Arch: amd64
Using buster or jessie (with or without capical) doesn’t seem to work.
What threw me off is that Ubuntu is synced by its release name (Focal, Groovy) but Debian requires the use of ‘stable’ instead?
I’m not sure however what its syncing exactly, and whether it will roll over to Debian 11 once that becomes “stable”. I’d rather “pin” it to a fixed release like 10.x. Also, not sure how to get 9.x to sync as a separate repository this way, oldstable or testing for the next stable?
Download policy on_demand doesn’t work on deb repos? Its already downloaded over 120GB and its not even half way :).
I tried your example, literally:
URL: Index of /debian/dists
Release: jessie
Arch: amd64
It throws an error message that jessie is not found. Using Debian9.13 gives the same error message:
No valid Release file found for ‘Debian9.13’.
Thanks again!